text: /**
   * @author sunag / http://www.sunag.com.br/
   */
  
  import { InputNode } from '../core/InputNode.js';
  import { UVNode } from '../accessors/UVNode.js';
  import { ColorSpaceNode } from '../utils/ColorSpaceNode.js';
  import { ExpressionNode } from '../core/ExpressionNode.js';
  
  function TextureNode( value, uv, bias, project ) {
  
  	InputNode.call( this, 'v4', { shared: true } );
  
  	this.value = value;
  	this.uv = uv || new UVNode();
  	this.bias = bias;
  	this.project = project !== undefined ? project : false;
  
  }
  
  TextureNode.prototype = Object.create( InputNode.prototype );
  TextureNode.prototype.constructor = TextureNode;
  TextureNode.prototype.nodeType = "Texture";
  
  TextureNode.prototype.getTexture = function ( builder, output ) {
  
  	return InputNode.prototype.generate.call( this, builder, output, this.value.uuid, 't' );
  
  };
  
  TextureNode.prototype.generate = function ( builder, output ) {
  
  	if ( output === 'sampler2D' ) {
  
  		return this.getTexture( builder, output );
  
  	}
  
  	var tex = this.getTexture( builder, output ),
  		uv = this.uv.build( builder, this.project ? 'v4' : 'v2' ),
  		bias = this.bias ? this.bias.build( builder, 'f' ) : undefined;
  
  	if ( bias === undefined && builder.context.bias ) {
  
  		bias = new builder.context.bias( this ).build( builder, 'f' );
  
  	}
  
  	var method, code;
  
  	if ( this.project ) method = 'texture2DProj';
  	else method = bias ? 'tex2DBias' : 'tex2D';
  
  	if ( bias ) code = method + '( ' + tex + ', ' + uv + ', ' + bias + ' )';
  	else code = method + '( ' + tex + ', ' + uv + ' )';
  
  	// add a custom context for fix incompatibility with the core
  	// include ColorSpace function only for vertex shader (in fragment shader color space functions is added automatically by core)
  	// this should be removed in the future
  	// context.include is used to include or not functions if used FunctionNode
  	// context.ignoreCache =: not create temp variables nodeT0..9 to optimize the code
  	var context = { include: builder.isShader( 'vertex' ), ignoreCache: true };
  	var outputType = this.getType( builder );
  
  	builder.addContext( context );
  
  	this.colorSpace = this.colorSpace || new ColorSpaceNode( new ExpressionNode( '', outputType ) );
  	this.colorSpace.fromEncoding( builder.getTextureEncodingFromMap( this.value ) );
  	this.colorSpace.input.parse( code );
  
  	code = this.colorSpace.build( builder, outputType );
  
  	// end custom context
  
  	builder.removeContext();
  
  	return builder.format( code, outputType, output );
  
  };
  
  TextureNode.prototype.copy = function ( source ) {
  
  	InputNode.prototype.copy.call( this, source );
  
  	if ( source.value ) this.value = source.value;
  
  	this.uv = source.uv;
  
  	if ( source.bias ) this.bias = source.bias;
  	if ( source.project !== undefined ) this.project = source.project;
  
  	return this;
  
  };
  
  TextureNode.prototype.toJSON = function ( meta ) {
  
  	var data = this.getJSONNode( meta );
  
  	if ( ! data ) {
  
  		data = this.createJSONNode( meta );
  
  		if ( this.value ) data.value = this.value.uuid;
  
  		data.uv = this.uv.toJSON( meta ).uuid;
  		data.project = this.project;
  
  		if ( this.bias ) data.bias = this.bias.toJSON( meta ).uuid;
  
  	}
  
  	return data;
  
  };
  
  export { TextureNode };
  